1. Lady Pohamba Private Hospital, Windhoek, Namibia (K.M.).
2. Non-Communicable Diseases Research Unit, South African Medical Research Council, Cape Town, Western Cape, South Africa (U.N.).
3. Department of Medicine, Faculty of Health Sciences, University of Cape Town, Western Cape, South Africa (U.N.).
4. Division of Infectious Diseases, Department of Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand and the Charlotte Maxeke Johannesburg Academic Hospital, South Africa (L.M.).
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand and the Chris Hani Baragwanath Academic Hospital, Johannesburg, Gauteng, South Africa (T.S.T.).
6. Division of Cardiology, Department of Internal Medicine, School of Clinical Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, Gauteng, South Africa (D.M., N.T.).